621432 has 80 divisors (see below), whose sum is σ = 2003760. Its totient is φ = 176256.

The previous prime is 621431. The next prime is 621443. The reversal of 621432 is 234126.

It is a happy number.

621432 is a `hidden beast` number, since 621 + 43 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 621432.

It is not an unprimeable number, because it can be changed into a prime (621431) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4468 + ... + 4604.

It is an arithmetic number, because the mean of its divisors is an integer number (25047).

2⁶²¹⁴³² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1001880).

621432 is an abundant number, since it is smaller than the sum of its proper divisors (1382328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621432 is a wasteful number, since it uses less digits than its factorization.

621432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 149 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 621432 is about 788.3095838565. The cubic root of 621432 is about 85.3357882323.

Adding to 621432 its reverse (234126), we get a palindrome (855558).

The spelling of 621432 in words is "six hundred twenty-one thousand, four hundred thirty-two".